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cebix |
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/* |
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* CmdPipe.cpp |
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* |
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cebix |
1.4 |
* Frodo (C) 1994-1997,2002-2005 Christian Bauer |
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cebix |
1.1 |
* |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation; either version 2 of the License, or |
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* (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, write to the Free Software |
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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*/ |
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#include "CmdPipe.h" |
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extern "C" { |
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#include <string.h> |
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#include <unistd.h> |
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#include <stdlib.h> |
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#include <sys/wait.h> |
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#include <sys/types.h> |
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#include <string.h> |
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#include <signal.h> |
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#if defined(__alpha__) |
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#include <cma.h> |
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#endif |
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#if defined(AIX) |
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#include <sys/select.h> |
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#else |
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#include <unistd.h> |
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#endif |
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#if defined(__linux__) |
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#include <sys/time.h> |
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#endif |
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#include <time.h> |
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#include <errno.h> |
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} |
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static void kaputt(const char * c1, const char * c2) { |
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fprintf(stderr,"error: %s%s\n",c1,c2); |
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exit(20); |
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} |
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Pipe::Pipe(void) : fail(true) { |
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fds[0] = 0; |
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fds[1] = 1; |
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if (-1 == pipe(fds)) { |
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kaputt("Pipe: ","unable to create pipe"); |
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return; |
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} |
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fail = false; |
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return; |
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} |
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Pipe::~Pipe(void) { |
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if (! fail) { |
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close(fds[0]); |
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close(fds[1]); |
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} |
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return; |
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} |
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unsigned long Pipe::ewrite(const void * buf, unsigned long len) { |
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unsigned long wsum = 0; |
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while (len) { |
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long wlen; |
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wlen = ::write(fds[1], buf, (long) len); |
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if (wlen <= 0) { |
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kaputt("Pipe::ewrite ","write-error"); |
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} |
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len -= wlen; |
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buf = (void*) ((char*) buf + wlen); |
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wsum += wlen; |
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} |
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return wsum; |
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} |
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unsigned long Pipe::eread(void * buf, unsigned long len) { |
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unsigned long rsum = 0; |
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while (len) { |
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long rlen; |
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rlen = ::read(fds[0], buf, (long) len); |
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if (rlen <= 0) { |
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kaputt("Pipe::eread ","read-error"); |
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} |
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len -= rlen; |
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buf = (void*) ((char*) buf + rlen); |
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rsum += rlen; |
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} |
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return rsum; |
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} |
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int Pipe::probe(void) const { |
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fd_set set; |
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FD_ZERO(&set); |
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FD_SET(fds[0], &set); |
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struct timeval tv; |
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tv.tv_sec = 0; |
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tv.tv_usec = 0; |
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int res; |
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// Use the following commented line for HP-UX < 10.20 |
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// res = select(FD_SETSIZE, (int *)&set, (int *)0, (int *)0, &tv); |
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res = select(FD_SETSIZE, &set, (fd_set *)0, (fd_set *)0, &tv); |
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if (res > 0) return -1; |
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return 0; |
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} |
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CmdPipe::CmdPipe(const char * command, const char * arg, int nicediff) : childpid(0), fail(true) { |
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if (tocmd.fail || fromcmd.fail) { |
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kaputt("CmdPipe: ","unable to initialize pipes"); |
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return; |
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} |
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childpid = fork(); |
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if (childpid == -1) { |
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childpid = 0; |
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kaputt("CmdPipe: ","unable to fork process"); |
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return; |
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} |
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if (childpid == 0) { |
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if (nicediff) { |
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if (-1 == nice(nicediff)) { |
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fprintf(stderr,"CmdPipe: unable to change nice-level (non-fatal)"); |
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} |
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} |
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dup2(tocmd.get_read_fd(), STDIN_FILENO); |
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dup2(fromcmd.get_write_fd(), STDOUT_FILENO); |
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execlp(command, "Frodo_GUI", arg, (char *)0); |
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kaputt("CmdPipe: unable to execute child process ",command); |
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_exit(0); // exit (and do NOT call destructors etc..) |
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} |
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fail = false; |
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return; |
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} |
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CmdPipe::~CmdPipe(void) { |
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if (childpid) { |
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int status; |
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waitpid(childpid, &status, 0); |
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if (status != 0) { |
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fprintf(stderr,"~CmdPipe child process returned error\n"); |
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} |
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} |
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} |
